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TBLEGRAPH APPARATUS. No. 516,552.

Patented Mar. 13

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41\10. 516.552. Patented-Mar. 13, 1894.

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JOSIAH A. PARKER, OF ST. LOUIS, MISSOURI, AND LELAND L. SUMMERS, OFCHICAGO, ILLINOIS; SAID SUMMERS ASSIGNOR TO SAID PARKER.

TELEG RAPH APPARATUS.

SPECIFICATION forming part of Letters Patent No. 516,552, dated March13, 1894.

' Application tiled February 23, 1893. Serial No. 463,510- (No model.)

i In the drawings Figure lis a diagrammatic view of our completeinvention. Fig. 2 is a side elevation of the transmitter'. Fig. 3 is adetail in side elevation showing the opposite side of the drum with thereleasing lever attached to the space key. Fig. 4 is atop phi/n view ofthe receiver with parts broken away. Fig. 5 is a side elevation of thedrum of the transmitter showingl the spring in connection therewithco-operating with the push pins or contacts. Fig. 6 is a side elevationof one of the relays (adapted to be operated by a current of variablestrength). Fig. 7 is an end view of the same showing the escapement withthe selecting apparatus. Fig. 8 is a detail view iu sideelevationshowing one of the levers of the receiver and the parts cO-.operatingtherewith; and Fig. 9 'is an end View of the two relays connected to theline wire.

The present invention is an improvement in the general line ofstenograph-telegraphing apparatus described in Letters Patent granted toJ. A. Parker February 24, 1891, No. 447,198, and to J. A. Parker and L.L. Summers, under date of November 29, 1892, No. 487,154. The principleof opposite currents is employed, coupled with conditions under whichsaid currents may be made to vary in strength and thus produce thenecessary results at the receiving station; at the same.

5o prising a series of linger levers or keys, aj

revolving drum having a series of movable push pins or contactsco-operating With'said levers, a lever operated by said pins coupledwith a resistance coil for varying theintensity of the transmittedcurrents, a second lever for reversing the polarities of the currents, arelay operating under the influence of a weak or strong currentcontrolling a lever which operates an escapement to which is secured arevolving brush, a disk or selecting appa- 6o ratus composed of a seriesof sections contacting with said brush, each section corresponding toone of the finger levers of the series, a second relay operating onlyunder a strong current and limiting the movementof the brush whichco-operates with the selecting apparatus; a series of magnets operatinga series of levers constituting the receiving instrument, a localbattery controlling the action of the magnets, and a traveling ribbon 7oat the receiving station. The details of the system may be described asfollows:

L', L2, L3, dac., represent tin ger levers or keys provided with buttonsas in the ordinary stenograph machine, the same being pivoted along thecommon fulcrum l-l. The rear ends of the said keysv are arranged toraise the bell-crank levers Z', Z2, Z3, &c., corresponding to therespective finger keys; the bellcrank levers are curved around thesurface 8: of a drum 2. The drum is mounted on a shaft 3 to which iskeyeda pinion 4 meshing with a gear 5 of any suitable motor, and when inoperation revolves in the direction shown by the arrows in Figs. 2and 3.rThe ends of the 85 bell-crank levers over the drum are provided withinclined surfaces so arranged as to come in contact with thecorrespondingly inclined. surfaces of the movable pins P', P2, P3, dac.,projecting from the surface of the drum, as 9o the drum is revolved, andthe bell-crank levers are operated upon depression of the keys. Thefinger-keys when in their normal position do not depress the fartherends of the bell-.7. crank levers, and accordingly said ends do '95, notcome in contact with the inclined surfaces of the ends of the pins P P2,P3, dac. 4These pins are arranged to slide longitudinally in the drumand in their normal position their opposite ends do not proj ectbeyondthe edge roc or side of thefdrux'mbut when the inclined edges of therespective 'pins come in contact of the drum. The levers L are formed inpairs each pairbeing connected to its corresponding lever Z, and eachcapable when depressed, of operating the space key L6, or the latter maybe operated singly as in the ordinary instrument (see Figs. 1, 2, 3, and4). Upon the depression of the space key brought abouteither byoperating the same singly or by the depression ot' any of the levers L,the lever 8 releases thepin or stop 6 or 7 with which it may at the timebe in contact, and the drum will accordingly be free to revolve. At thesame time any pin P willbe pushed outward by any lever Z according towhich finger key L of the series is depressed. As the drum revolvesunder the influence ofthe power communicating motion through the gear 5and pinion 4, motion is communicated to the escapement9 mounted on theshaft 3, which controls the movement ofthe contact lever 10 pivoted at11. The escapement 9 is provided with one half the number of teeth thatthere are pins in the drum, so that when one tooth in the escapement hasbeen passed, the contact le ver 10 has madev contact on the contactpoint 12 and returned to the contact point 13, and the drum will havepassed two pins as to the distance traveled by its periphery.v Itfollows therefore that every tooth ofthe escapement 9 corresponds to twopins on the drum, and each Contact of the'contact lever 10 correspondsto one pin; but as each contact 12 and 13 reverses the current passingfrom the main battery B, thecurrent will be positive for one contact orone pin, and negative for the next contact or the following pin. Itmatters not whether the pins P are pushed out or not, each pin isrepresented by one contact and a current of one polarity, and thesucceeding pin by a second contact and a current of opposite polarity.When however, the pins are forced outwardly by the depression of anyoneor all of the finger levers or keys L and through the medium of thebell-crank levers Z, each pin as it is forced outward from the end ofthe revolving drum 2 strikes the lower curved end 16 of a lever 14pivoted at 15 and causes it to make contact with the point 17. lf allthe pins have been pushed out either successively or simultaneously,

then, as the drum revolves their projecting ends will come successivelyin contact with the end 16 of the lever 14 and cause the opposite end ofthe same to make a succession of contacts with the point 17; but whennolevers L have been depressed and consequently no pins P have beenpushed out to act on the lever 14, then the opposite end of the levermakes Contact with the isolated point- 18 under the influence of thespring 19. It will thus be seen that motion is communicated to lever 14by the depression of any key L, and that while all the keys may bedepressed4 simultaneously and all pins P', P2, P3, dre., will respond"and be set simultaneously with the depression of the levers L', L2, L3,the., the combination of such levers and pins will come in contact withthe lever 14in succession, and the contacts thus made will be sent toline in succession. Itwillthusbeapparentthat anycombination that can bemade by depressing the keys L, and Z, either singly or in combination,can be transmitted to linewithout coniicting. After the combination hascome in contact with the end 16 of the lever14 the pins pass on underthe inclined spring20se`cu`red toanystationary part ofthe device wherethey arereturned to their normal position. The drum shown has two setsof pins, each `set being com`-` posed of six pins,one for each of thefive charac-4 ter keys and one for the space key." However, it is notnecessaryn to provide the space key L with an inclined lever Z6, as thespace key is operated by all the other keys, and consc'zequentlyJ thepin P6 can be fixed so that its normal'po sition is projecting outbeyond the druin`(see Figs. 4 and 5). l with the curved end of the lever14 whenever the drum is released, and if the space key is the only onedepressed the space pin is the only one to operate lever 14. Inpracticethe space pin is operated by a spring (seeFig. 5) allowing it tobe pressed into the drum as it It therefore comes in contact passes thespring 20 (which sets all pins back j in the drum). After passing spring20 the weak spring on the space pin pushes said pin to its normalposition, where it can again engage the lever 14. The lever 8 secured tothe space key L6, and which isnormally in contact with one or'the otherof the stops 6 or 7 is pivoted at 2l, and is kept normally balanced bythe arm 22 and plate 23 (which latter is always struck or operated bythe depression of any of the keys or levers L). rlhe lever 8 extends toa distance somewhat beyond the center of the rotating drum 2, but

does not project beyond the periphery there-` ot'. At its end the saidlever has a right-angled projection 24. Intermediate between the pivotalpoint 2l and the projection 24 is a hook-shaped extension 25 bentoutwardly at its junction with the lever S so as to allow a projecting'pin to pass (see Fig. tension 25 and the projection 24 act as anescapement for the stops 6 and 7. It is to be noted that there are twosets or series'or This) exi` groups of pins P operated by the levers Land astop 6 and 7 for each series. The stops are necessary to preventrepetition of any character or word at the receiving station if thefinger levers Lshould 'accidentally be held down beyond the timenecessary to transmit any one character. Assuming the ina-- chineto beat rest and the several parts in their normal position, the'stop 6 willbe in a position as shown in Fig. 3, that is to say, resting against theangular projection 24, and

between the same and the bevel 26 of the extension 25 is equal to thespace between anyr two pins. It will be remembered that there are sixpins P, five of which are operated lby the levers L, and one-the spacepinhaving a pin already projecting from the end of the drum. The spacepin follows the remaining pinsP and is the last pin of the series. Thisarrangement is obvious since it is .necessary to have a space afterevery word or character. As the drum 2 revolves the stop 7 will be thenext -to strike the bevel 26 of the hook-shaped extension 25. This itwill do as the fifth pin P5 has passed the bevel 26, that is, the stop 7will stop the drum 2 on the fifth contact by striking the bevel 26 inits depressed position. As -just stated, the drum 2 is stopped on thefifth contact. Now as the lever L6`or levers L are allowed to resumetheir normalv position, the bevel 26 of the hook-shaped eX tension 25will be raised sufficiently to let the stopl 7 pass it (a distanceequalto that between two consecutive pins) and kto the position previouslyoccupied by stop 6; and thus the operation can be repeated indefinitely.In practice of course the stops 6 and 7 are placed opposite the fifthpin or contact of each series so as to cause the drum to stop on thefifth contact (the last pin of the series except the space pin). Then,when the parts are permitted to resume their normal positions the spacepin, which always projects from the end of the drum will be free to act,during the interval that the stop 6 or 7 passes from' the point 26 toitsnormal position (a distance of from one pin to the next following pin),and thus announce the end of a word or character.

Between the pivotalk point of the lever 14 and the wire which extendsfrom the point 17 to the pivotal point 11 of thecontact lever 10 isinterposeda resistance coil R (see Fig. 1).

From the foregoing the following will be obvious: If the drum 2 beallowed to revolve by depressing any of the levers L, (be it a characterlever or the space lever,) the e'scapement 9 mounted on the shaft 3 willrevolve and oscillate the con-tact lever 10, causing the end of thesamek to alternately make contact with the points 12 and 13 and thusalternately reverse thev polarity or direction of the current with eachcontact; but as there are one-half the number of teeth in the escapementthat there are pins on the drum, each tooth represents two pins and twocontacts, and each contact, one pin. Consequently each pin isrepresented bya current of opposite polarity or direction tothat pre'-ceding or following it. Now, if we depress all the levers Lsimultaneously (the space lever may always be considered as depressed`since its pin P6 always projects from the end of the drum) the drum asitv rotates will bring successively each projecting pin Pto act on thelever 14 and force the end of the same to make contact with the point17. Under those circumstances the resistance R would be thrown out ofcircuit and a series of strong currents would be sent to line. Ifhowever we depress only a part of the levers L thenl onlya part of thepins P will be forced from the end of thedrum, and only ,those forcedout would operate the lever 14 to contact with point 17 to send a strongcurrent to line, and those not forced out wouldpass the lever 14(brought back to point 18 under the.

inu'ence of spring 19), the resistance R would be brought into circuit,and'only a weak cur` rent would be sent to line; and if we only depresst`he space lever, the remaining live character pins being untouched,then five weak currents would successively be sent to line, followed byone strong current of the succeeding sixth space pin. It will thus beseen that any lever L when depressed will send to line a strong-current,the lpolarity or direction of which will `depend upon the position ofthe contact lever 10,and that the immediately succeeding lever ifdepressed will send a strong current to line of opposite polarity, dac.,and if such lever is not depressed,then a weak current of oppositepolarity will be sent to line.

The present invention contemplates the employment of two species ofrelays, the first designated by N and capable of operation under a weakcurrent (and also a strongcurrent),

IOO

and the second designated by O and'adap'ted to operate only by a strongcurrent. Hence relay O will operate only when a. key or combination ofkeys'is struck (being the onlycondition under which a strong current canbe sent to line). The positive and negative currents of the line operateto oscillate the vibrating escapement lever 27 of the polarized relay'N,and thus operate the escapementp28 mounted on the shaft 29 which isturned by 'a suitable motor (not shown) geared to the pinion 30 keyed tosaid shaft. Secured to the opposite end of the shaft 29 is an arm 31carrying a contact brush 32, so that, as the escapement 28 revolves, thebrush 32 revolves with it, both being mounted on the same shaft. Theescapement 28 has six teeth, a number equal to one-half the number thatthe drum has pins, so that each escapement tooth corresponds to two pinson the drum,ortwo contacts IIO 'of the contact lever 1 0; and aseachcontact t will permit the escapement lever 27 to swing to one side,and the next contact w'illreturn it to its original position, the twomovements will have allowed the escapement 28 to turn the ydistance ofone tooth, and the drum will'have passed two pins; and when theescapement 'moves three teeth, the'drum has moved six pins, that is tosay, one character or word has been completed and sent to line. The number of pins in the drum is of coursea common multiple of the number ofcontacts and the number of teeth on the escapement which go to form acharacter; and the number of teeth which the escapement must pass torepresent a character is of course a divisor of the number of pins. Itwill thus be seen that the escapement 28 merely controls the movement ofthe contact brush 32, which latter makes electric contact with thesections c', c2, c3, dto., of the connecting cylinder C, the severalsections c corresponding with the pins P and levers L. The cylinder Chas the same number of sections c that the drum has pins and thesesections are connected permanently with the local magnets m', m2, m3,dac., under the key of the receiving instrument, the magnets m operatingthe levers of the receiving instrument `recorder in the ordinary manner.It will further be seen that these magnets m will be connected to onepole of a local battery by means of the brush 32, as the brush makescontact with the particular sections c corresponding to the magnets. Theother pole of the battery will however, remain open until closed by thearmature of relay O closing the contact points 33, 34. m correspondingto the contact c that the brush 32 is resting on, will then respond andthe lever over the magnet fm will be pulled down which corresponds tothe pin P at the sending station which has been thrown out by the leverL. Thus the particular lever depressed at the sending station willdepress its corresponding lever R at the receiving station, and as eachvof these levers isindependent of its neighbor any combination of leverscan be made simultaneously, and the combinations will be sent to line insuccession and will operate the corresponding levers at the receivingstation in succession, but as the paper or ribbon is not moved forwarduntil the sixth lever or current is sent, and after all other levers sointended will have been operated, and as the paper has remainedstationary, the result will be the same as though all the keys wereoperated together at the receiv` ing station the same as at the sending,the

paper being moved forward on the last space for the next combination. Itis of course necessary that when any particular finger lever or key L isdepressed, that the brush 32 at that time be in contact with the sectionc corresponding to said lever, so that the corre spending lever R' atthe receiving station may respond thereto; but it sometimes happensowing to line or other trouble that when a lever L is operated that theescapement 28 has advanced a tooth and the brush 32 has correspondinglyadvanced in contact beyond the proper section c. It is obvious thatunder such circumstances the receiver must be brought into unison withthe transmitter. This is accomplished as follows by the selectingapparatus shown in Figs. 1, 6, 7, and 9:

The local magnet The armature 35 of relay O is provided with aprojecting arm 36 at right angles thereto; this compound armature ispivoted at 37. When the brush 32 reaches the contact c5 it cannot turnany farther unless relay O is operated by a strong current closingcontact points 33, 34 and causing lever 36 to be lowered, so that brush32 can pass the same and out of contact with it. As a strong currentalways follows the fifth pin l? or contact 5 (that is, the fifthcontact), on account of the sixth or space pin being permanentlyprojecting in the transmitter because the space key is operated by allthe others, the brush 32 will not be retarded so long as the instrumentis in unison or step with the transmitter; but suppose the space keyonly is operated and that line or other trouble has caused theescapement to be advanced a tooth or two. Now when the space key only isoperated, the currents going to line will be five weak currents followedby a strong current (asno pins but the space will have been moved toposition). The escapement being already advanced a tooth, or twopulsations (one plus the other minus) and consequently, when three ofthe currents have been received the brush 32 will be in contact withlever 36 and will he retarded until released by a strong currentoperating relayO (see Fig. 9). As two more currents follow before thesixth releases the brush, it will be seen that the brush will be heldback this nu mberof pulsations or just the amount it was advanced ont ofplace. The machine will therefore come to unison whenever a spacecurrent only is sent, or after every word. As stated, the relay Oresponds only to a strong current on the line wire (a single line wirebeing used), and in so responding the armature 35 thereof makes contactbetween the points 33, 34 and thus completes the circuit from the localbattery which operates the magnets m', m2, m3, dac., and theircorrespondin g levers R', R2, R3, (he. Now, we have seen that thedepression of any leverL pushes out its corresponding pin P, and thatthe pins P operating the lever 14 cause the same to make contact withthe point 17 and send a strong current to line; but each successive pin(whether the pins are pushed out simultaneously or in succession) sendsto line a strong current of opposite polarity, and as relay O mustrespond to a strong current of either polarity, the coils thereof (threein number) are so wound that currents of either polarity op erate toattract the armature 35 to the pole 38 on thatside of the armaturenearest the relayN (see Fig. l). The armature 35 is properly weighted onthe opposite side of the pivot 37 to restore it to its normal positionwhen' the current ceases.

Having fully described our invention, what we claim isl. In a telegraphapparatus, a single line wire, a series of revolving contacts or pinsadapted to send a word or character over said line, depression keysoperating said contacts,

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and the means substantially as described for bringing the keys and pinsinto co-operation upon either a successive or simultaneous depression ofthe keys, substantially as set forth.

2. In an electric telegraph, a single line Wire, finger levers or keysadapted to be depressed singly or simultaneously, the mechanismsubstantially as described co-operating with said keys for sending toline successively the record of each depression of said keys, andWithout coniiicting, substantially as set forth.

3. In a telegraph apparatus, a single line Wire, a transmitter having aseries of revolving contacts or pins adapted to send a character or wordover said line, a receiving station, a selecting apparatus along saidline, and the means substantially as described cooperating With the`selecting apparatus to bring the transmitter and receiver into unison,substantially as set forth.

4. The combination, in an electric telegraph, of keys or pairs of keysarranged for the thumbs and corresponding fingers of both hands, so thateither of the thumbs or either' of the corresponding fingers by actionupon its proper key shall, produce the same result as the thumb orcorresponding finger of the other hand, a single electric contact forevery alternate lever of the keys, to send to line a positive current;and a second single contact for the remaining levers of said keys, tosend to line a negative current, and a single line Wire, substantiallyas set forth.

5. The combination in an electric telegraph, of a series of depressionkeys, a contacting lever, intermediate mechanism for setting saidcontacting lever into vibration, contact points establishingsuccessively currents of opposite polarities corresponding with thesuccessive operation ofthe individual keys, and a single line Wire forsending the respective currents, substantially as set forth.

6. The combination, in an electric telegraph, of a set of contactpoints, a series of finger levers or depression keys, intermediatemechanism between said finger levers and contact points adapted to sendcurrents of one polarity through one of said contacts, and currents ofopposite polarity through the second contact point, the currents of onepolarity representing a set of alternate depression keys, and those ofthe opposite polarity representing the remaining keys, substantially asSet forth.

7. In a telegraph apparatus, a series of depression keys, a single linewire, mechanism for sending necessary impulses along said line upondepression of any key, mechanism cooperating with any two consecutivekeys for sending to line currents of opposite polarity and of thesamestrength upon depression of both of said keys, and of oppositepolarity and variable strength upon depression of only one of said keys,substantially as set forth.

8. In a telegraph apparatus, a series of depression keys, tWoconsecutive' ones of which v vhen depressed being adapted to sendcurrents of opposite polarities but of the same strength, and ofopposite polarities but of variable strength when only one of said 4twokeys is depressed, a single line Wire, a relay on said line madeoperative by currentsirrespective of their strength, and a second relaymade operative only under a strong current, substantially as set forth.

9. In a telegraph apparatus, a single line Wire, a series of depressionkeys, intermediate mechanism substantially as described for sending astrong current along the line and recordinga character at the receivingstation on depression of any one of said keys, and the meanssubstantially as described for indicating the non-depression or normalposition of any key succeeding by sending to line a Weak current,substantially as set forth.

l0. In a telegraph apparatus, a single line wire, a series of depressionkeys, corresponding pins or contacts adapted to send electric currentsover said line, electric contacts controlling the polarity of saidcurrents, a rotating toothed escapement, a lever operated by therespective currents and controlling said escapement, the number of saidkeys beinga multiple of the number of teeth on the escapement whichconstitute a character, and a common multiple of the said number ofteeth and the number of contacts, substantially as set forth.

ll'. The combination of a double keyed transmitting instrument, in whichthe -same characters are formed by the corresponding linger of eitherhand, a single line wire, necessary electrical energy, a series ofstep-bystep or successive contacts or pins, and a toothed escapement,the number of contacts being a multiple of theV number of yteeth in theescapement, a suitable divisor of which multiple represents the numberof teeth the escapement has passed to record a Word or character,substantially asset forth. i

l2. ln an elect ric telegraph, the combination of a revolving drum, aseries of depression keys controlling the motion of the same, one ofwhich keys constitutes the spacekey and adapted to automatically send astrong current over the line upon the rotation of said drum,substantially as set forth.

13. The combination in an electric telegraph, of a single line wire, atransmitting device having a number of keys adapted to successively sendto line impulses of opposite polarities, a selecting device along theline controlled by the respective impulses, and means on the main linefor bringing said selecting de- IOO IIO

vice into adj ustment'at the end of each word or character,substantially as set forth.

14. The combination in an lelectric telegraph, of a single line wire,depression keys or pairs of depression keys arrangedfor the thumbs andcorresponding fingers of both hands, electric contacts corresponding toeach pair of keys for sending to'line currents of opposite polarities,intermediate, mechanism co-operating with said contacts uponasimultaneous or successive depression of said keys t o send saidcurrents of opposite polarities to line, substantially as set forth.

15. The combination in an electric telegraph, of a single line Wire, aseries of depression keys, revolving contacts in groups orseriesco-operating with said keys, and adapted on depression of the space keyto send a series of Weak currents alternately positive and negativealong the line, followed by a strong current on releasing the same,substantially as set forth.

16. The combination in an electric telegraph, of asingle line wire, atransmitting device havinga number of keys adapted to send successivelyeach an impulse of opposite polarity from the one preceding, a selectingdevice along said wire, a relay'ad'apted to be operated by weak currentsand controlling said selecting device, a second relay operated only by astrong current, and a vibrating armature or lever connectedfto saidsecond relay for adj listing w'tlies'electing device controlled bythefirst relay, substantially as set forth. 17. In an electric telegraph,the combination of asinglelinewire, a selecting device on said`linehaving auseries of l contacting sections,eachsection,beingresponsive to a particular lrnpulseon `said line, arevolving brush con! tacting' successively with'the several sections andconnected with one end of a local battery, a series of magnets or coilshaving severally at oneend wire connections with the` respect` 1vesections, a relay operated only by a strong current, arightangledarmature ,operatedby said relay and limiting the movement ofthe revolving brush, the e said magnets having' jointly `a wireconnection with the armature of said 'relay`,'and the opposite end ofthesaidl armature havinga wire connection With the other end ofthe localbattery to complete the circuit and operate `themagnets,`substan tiallyas set forth.

18. In an electric telegraph havingasingle line wire, the combination ofa series of de? pression 'keys having a common pivotal axis, a seriesofbell-crank levers operated by said keys upon -depression of thelatter,a revolving drum having a Series of movable pinsor contacts, saidbell-crank levers and pins hav` ing co-operatinginclined edgesby theaction of which the pins are forced outfrom the drum when in contactwith the bell-crank levers,

upon rotation `of said drum, substantiallyas set forth.

19,."The combination in an` electric tele-` graph of a single line wire,a revolving drum mounted ,on a suitable shaft, aseries of contacts orpins movable therein and projecting from the edge of the drumwhenshiftedfrom` each successive pin or contact, substantially as setforth.

20. The combination in an electric telegraph of a singleline wire, atransmitter com prising a revolving drum, a series of movable contactsor pins projecting from the periphery of the drum and adapted to beoperated by suitable levers, an oscapement wheel mounted on the shaft ofthe drum and turning with the same, and having one-half the number ofteeth that the drum has pins,a pivoted escapement lever oscillated bysaid teeth, and contact point-s connected with the opposite poles of themain battery for reversing the current with each oscillationcorresponding with each successive pin or contact, substantially as setforth.

21. The combination inan electric tele-F graph, of a revolving drum,fixed stopson one,

side ofthe drum, depression keys one of which e e is a space key, alever connected to said` space key andlnormally in contact with one ofsaid stopsfor holding the drum stationaiy,sub stantially as set forth.

22. In an electric telegraph, a transmitter having a revolving drum,stops 6 and? located` diametrically opposite each other at'4 one end .j

of the drum,a leveri 8 attached" tothe space key and having a rightangled projectioiix` against which oneof the stops is` normallyincontact, a hook-shaped extension lcarried` by said lever andadaptedto'ccme'iin'd contact 'y withthe following stopupon theYdepression` of the lever, and releasing the same upontlie saidleverassuming its normal positioinsnbstantially as set forth. l 23. `Inan electric telegraph,a revolving contact drumffxed` stopsat one `endthereof, a space key, and a lever connected thereto and TOO normally incontact with one of said stops,

substantially asset forth.

24. In a telegraph apparatusa.revolving drum having a'spaceA pinnormally projecting from one endthereof, means forpusl'iing.` the saidpin back within the drum, and a weaker spring forrestoring `the Spacepin to its "nor-4 mal position, substantially asset forth.

25. In an electric telegraph, the combination of a single line wire, arevolving drum, a piv- IIO oted lever 14, meanscarried by saidflrunrlfor oscillating said lever, a contact 17, an escapement 9 revolving withsaiddrum,an ,es-j, capementlever 10 oscillated by said escape'` ment,contact points 12 and 13 connected to the opposite poles of the mainbattery, said escapement lever making contact alternately" withpoints 12and 13'upon rotation of the` drum, a wire connection between lever 10and contact point 17, and a resistance between lating armaturecontrolled` by said relay, an escapement mounted on a suitable shaft,said escapement being regulated by said armature,

a brush revolved by said shaft, power for operating said shaft, acylinder or disk having a suitable number of sections corresponding withthe depression levers of the transmitter, said brush making electriccontact with the several sections in response to the corresponding leverof the transmitter, substantially as set forth. p

27. In an electric telegraph, a single line Wire, a transmitter, aselecting device on said line having a revolving contact brush, a relayO operated only by strong currents, a right angled armature operated bysaid relay and pivoted at the right angle, the projecting arm of whicharmature controls the limit of travel of the revolving brush, andreleases the said brush upon the passage of a strong current through therelay N, substantially as set forth.

28. In a telegraph apparatus, the combination of a single line Wire, atransmitter hav- JosIAH A. PARKER. LELAND L. sUMMERs.

Witnesses:

F. E. BAKER, H. C. WRIGHT, AMERRILL WATSON, G. E. MCFADDIN.

